510 Johnston and Adams — Influence of Pressure on the 



table thus obtained, giving e in terms of t, another and more 

 convenient table was constructed, giving t for each even 100 

 microvolts. 



This table is presented in abridged form — for every 500 

 microvolts — in Table I, in which are also included the E.M.F.'s 

 corresponding to the fixed reference points. Incidentally it may 

 be noticed (1) that a quadratic equation will not express the 

 relation between t and e with sufficient accuracy ; for such an 

 equation when passed through the steam, benzophenone, and 

 zinc points misses the naphthalene point by 1*5° ; (2) that 

 the cubic equation of the above form fits the data with 

 much greater accuracy than the inverse form of function, 

 t=Ae+£e*+Ce\ 



Table I. 



Abridged Standard Curve for Copper-constantan Elements. 



Microvolts 







500 



1000 



500 



2000 



500 



3000 



500 



4000 



4227 



500 



5000 



500 



6000 



500 



7000 



500 



8000 



500 



9000 



500 



10000 



10119 



500 



11000 



500 



t 

 



12-94 



25-53 



37-77 



49-72 



61*40 



72-83 



84-05 



95-07 

 100-00 

 105-88' 

 116-52 

 127-00 

 137-32 

 147-50 

 157*55 

 167-48 

 177-29 

 186-99 

 196-58 

 206-07 

 21547 



217-7 

 224-79 

 234-03 

 243-19 



Diff. 



1294 

 1259 

 1224 

 1195 

 1168 

 1143 

 1122 

 1102 



1081 



1064 



1048 



1032 



1018 



1005 



993 



981 



970 



959 



949 



940 



932 

 924 

 916 



Microvolts 

 11500 

 12000 



500 

 13000 



500 

 14000 



500 



U995 

 15000 



500 

 16000 



500 

 17000 



500 

 18000 



500 

 19000 



500 

 20000 



500 

 21000 



500 



21755 

 22000 



500 

 23000 



t 

 243-19 

 252-28 

 261-30 

 270-25 

 279-14 

 287-97 

 296-75 



305-4 

 305-48 

 314-15 

 322-76 

 331-31 

 339-80 

 348-24 

 356-62 

 364-95 

 373-24 

 381-49 

 389-70 

 397-87 

 406-00 

 414-09 



418-2 

 422-14 

 430-15 

 438-12 



Diff. 



909 

 902 

 895 



889 

 883 

 878 

 873 



867 

 861 

 855 

 849 

 844 

 838 

 833 

 829 

 825 

 821 

 817 

 813 

 809 

 805 



801 



797 



This table may be used for any element with the aid of its 

 deviation curve, which is obtained by plotting at two or more 

 known temperatures the differences between the readings of 

 the element in question and the standard curve. Its use thus 

 saves much calculation and recalculation of thermoelement 



